US9046772B2 - Monomer, polymer, resist composition, and patterning process - Google Patents
Monomer, polymer, resist composition, and patterning process Download PDFInfo
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- US9046772B2 US9046772B2 US14/171,042 US201414171042A US9046772B2 US 9046772 B2 US9046772 B2 US 9046772B2 US 201414171042 A US201414171042 A US 201414171042A US 9046772 B2 US9046772 B2 US 9046772B2
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- methyl
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- lactate
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- LFGLMIDUHJBKEM-UHFFFAOYSA-N [H]C([H])(C)C([H])(C)C(=O)OCC(=O)OC1C2CC3C1OC(=O)C3C2C(=O)OC1(CC)C2CC3CC(C2)CC1C3.[H]C([H])(C)C([H])(C)C(=O)OCC(=O)OC1C2CC3C1OC(=O)C3C2C(=O)OC1(CC)CC2CC1C1C3CCC(C3)C21.[H]C([H])(C)C([H])(C)C(=O)OCC(=O)OC1C2CC3C1OC(=O)C3C2C(=O)OC1(CC)CCCC1 Chemical compound [H]C([H])(C)C([H])(C)C(=O)OCC(=O)OC1C2CC3C1OC(=O)C3C2C(=O)OC1(CC)C2CC3CC(C2)CC1C3.[H]C([H])(C)C([H])(C)C(=O)OCC(=O)OC1C2CC3C1OC(=O)C3C2C(=O)OC1(CC)CC2CC1C1C3CCC(C3)C21.[H]C([H])(C)C([H])(C)C(=O)OCC(=O)OC1C2CC3C1OC(=O)C3C2C(=O)OC1(CC)CCCC1 LFGLMIDUHJBKEM-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/283—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing one or more carboxylic moiety in the chain, e.g. acetoacetoxyethyl(meth)acrylate
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- G—PHYSICS
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/52—Esters of acyclic unsaturated carboxylic acids having the esterified carboxyl group bound to an acyclic carbon atom
- C07C69/533—Monocarboxylic acid esters having only one carbon-to-carbon double bond
- C07C69/54—Acrylic acid esters; Methacrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/62—Halogen-containing esters
- C07C69/65—Halogen-containing esters of unsaturated acids
- C07C69/653—Acrylic acid esters; Methacrylic acid esters; Haloacrylic acid esters; Halomethacrylic acid esters
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/66—Esters of carboxylic acids having esterified carboxylic groups bound to acyclic carbon atoms and having any of the groups OH, O—metal, —CHO, keto, ether, acyloxy, groups, groups, or in the acid moiety
- C07C69/67—Esters of carboxylic acids having esterified carboxylic groups bound to acyclic carbon atoms and having any of the groups OH, O—metal, —CHO, keto, ether, acyloxy, groups, groups, or in the acid moiety of saturated acids
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/74—Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring
- C07C69/75—Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring of acids with a six-membered ring
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/22—Esters containing halogen
- C08F220/24—Esters containing halogen containing perhaloalkyl radicals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
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- G—PHYSICS
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
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- G—PHYSICS
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2041—Exposure; Apparatus therefor in the presence of a fluid, e.g. immersion; using fluid cooling means
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- G—PHYSICS
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
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- G—PHYSICS
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- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/30—Imagewise removal using liquid means
- G03F7/32—Liquid compositions therefor, e.g. developers
- G03F7/325—Non-aqueous compositions
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- C07C2101/08—
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- C07C2101/14—
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2601/00—Systems containing only non-condensed rings
- C07C2601/06—Systems containing only non-condensed rings with a five-membered ring
- C07C2601/08—Systems containing only non-condensed rings with a five-membered ring the ring being saturated
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2601/00—Systems containing only non-condensed rings
- C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
- C07C2601/14—The ring being saturated
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/1053—Imaging affecting physical property or radiation sensitive material, or producing nonplanar or printing surface - process, composition, or product: radiation sensitive composition or product or process of making binder containing
- Y10S430/1055—Radiation sensitive composition or product or process of making
- Y10S430/114—Initiator containing
Definitions
- This invention relates to a monomer useful as a starting reactant for functional, pharmaceutical and agricultural chemicals, a polymer comprising recurring units derived from the monomer, a resist composition comprising the polymer, and a pattern forming process using the resist composition.
- the monomer is useful for the preparation of a polymer that finds use as a base resin in a resist composition which is subject to a pattern forming process involving exposure of resist film, deprotection reaction with the aid of acid and heat, and development in an organic solvent to form a negative tone pattern in which the unexposed region is dissolved and the exposed region is not dissolved.
- the process that draws attention under the current circumstances is a double patterning process involving a first set of exposure and development to form a first pattern and a second set of exposure and development to form a pattern between the first pattern features.
- a number of double patterning processes are proposed.
- One exemplary process involves a first set of exposure and development to form a photoresist pattern having lines and spaces at intervals of 1:3, processing the underlying layer of hard mask by dry etching, applying another layer of hard mask thereon, a second set of exposure and development of a photoresist film to form a line pattern in the spaces of the first exposure, and processing the hard mask by dry etching, thereby forming a line-and-space pattern at a half pitch of the first pattern.
- An alternative process involves a first set of exposure and development to form a photoresist pattern having spaces and lines at intervals of 1:3, processing the underlying layer of hard mask by dry etching, applying a photoresist layer thereon, a second set of exposure and development to form a second space pattern on the remaining hard mask portion, and processing the hard mask by dry etching.
- the hard mask is processed by two dry etchings.
- the hole pattern is difficult to reduce the feature size.
- an attempt is made to form fine holes by under-exposure of a positive resist film combined with a hole pattern mask. This, however, results in the exposure margin being extremely narrowed. It is then proposed to form holes of greater size, followed by thermal flow or RELACS® method to shrink the holes as developed.
- control accuracy becomes lower as the pattern size after development and the size after shrinkage differ greater and the quantity of shrinkage is greater.
- the hole shrinking method the hole size can be shrunk, but the pitch cannot be narrowed.
- Non-Patent Document 1 a pattern of X-direction lines is formed in a positive resist film using dipole illumination, the resist pattern is cured, another resist material is coated thereon, and a pattern of Y-direction lines is formed in the other resist film using dipole illumination, leaving a grid line pattern, spaces of which provide a hole pattern.
- a hole pattern can be formed at a wide margin by combining X and Y lines and using dipole illumination featuring a high contrast, it is difficult to etch vertically staged line patterns at a high dimensional accuracy.
- Non-Patent Document 2 It is proposed in Non-Patent Document 2 to form a hole pattern by exposure of a negative resist film through a Levenson phase shift mask of X-direction lines combined with a Levenson phase shift mask of Y-direction lines.
- the crosslinking negative resist film has the drawback that the resolving power is low as compared with the positive resist film, because the maximum resolution of ultrafine holes is determined by the bridge margin.
- a hole pattern resulting from a combination of two exposures of X- and Y-direction lines and subsequent image reversal into a negative pattern can be formed using a high-contrast line pattern of light.
- holes having a narrow pitch and fine size can be opened as compared with the prior art.
- Non-Patent Document 3 reports three methods for forming hole patterns via image reversal.
- the three methods are: method (1) involving subjecting a positive resist composition to two double-dipole exposures of X and Y lines to form a dot pattern, depositing a SiO 2 film thereon by LPCVD, and effecting O 2 -RIE for reversal of dots into holes; method (2) involving forming a dot pattern by the same steps as in (1), but using a resist composition designed to turn alkali-soluble and solvent-insoluble upon heating, coating a phenol-base overcoat film thereon, effecting alkaline development for image reversal to form a hole pattern; and method (3) involving double dipole exposure of a positive resist composition and organic solvent development for image reversal to form holes.
- the organic solvent development to form a negative pattern is a traditional technique.
- a resist composition comprising cyclized rubber is developed using an alkene such as xylene as the developer.
- An early chemically amplified resist composition comprising poly(tert-butoxycarbonyloxy-styrene) is developed with anisole as the developer to form a negative pattern.
- Patent Documents 1 to 3 disclose resist compositions for organic solvent development comprising a copolymer of hydroxyadamantane methacrylate, a copolymer of norbornane lactone methacrylate, and a copolymer of methacrylate having acidic groups including carboxyl, sulfo, phenol and thiol groups substituted with two or more acid labile groups, and pattern forming processes using the same.
- Patent Document 4 discloses a process for forming a pattern through organic solvent development in which a protective film is applied onto a resist film.
- Patent Document 5 discloses a topcoatless process for forming a pattern through organic solvent development in which an additive is added to a resist composition so that the additive may segregate at the resist film surface after spin coating to provide the surface with improved water repellency.
- the positive development system involving deprotection reaction to generate a carboxyl group and subsequent neutralization reaction with aqueous alkaline developer to improve a dissolution rate achieves a high dissolution contrast in that the dissolution rate differs between the unexposed and exposed regions by a factor of more than 1,000.
- the negative development system via organic solvent development provides a low contrast because the dissolution rate in the unexposed region due to solvation is low, and the dissolution rate thus differs between the unexposed and exposed regions by a factor of less than 100.
- the organic solvent development is low in dissolution contrast, as compared with the positive resist system adapted to be dissolved in alkaline developer when deprotection reaction takes place to produce acidic carboxyl or phenol groups.
- the alkali dissolution rate differs more than 1,000 times between unexposed and exposed regions, whereas the difference in the case of organic solvent development is at most 100 times, and only about 10 times for certain materials. No sufficient margin is available.
- the dissolution rate is improved by neutralization reaction with carboxyl groups.
- the dissolution rate is low because dissolution is solely due to solvation.
- the resist It is necessary not only to improve the dissolution rate of the unexposed region, but also to reduce the dissolution rate of the exposed region that is a remaining portion of resist film. If the dissolution rate of the exposed region is high, the thickness of the remaining film is so reduced that the underlying substrate may not be processed by etching through the pattern as developed. Further it is important to enhance the gradient or gamma ( ⁇ ) at the dose corresponding to dissolution/non-dissolution conversion. A low ⁇ value is prone to form an inversely tapered profile and allows for pattern collapse in the case of a line pattern. To obtain a perpendicular pattern, the resist must have a dissolution contrast having a ⁇ value as high as possible.
- An object of the invention is to provide a photoresist composition which displays a high sensitivity and a high dissolution contrast during organic solvent development.
- an object of the invention is to provide a monomer, a polymer prepared from the monomer and suited for use in photoresist compositions, a resist composition comprising the polymer as a base resin, and a pattern forming process using the resist composition.
- a resist composition comprising a polymer obtained from a monomer having the general formula (1) as a base resin is improved in many factors including dissolution contrast during organic solvent development to form negative patterns, size uniformity of hole patterns formed via positive/negative reversal, exposure latitude, LWR and MEEF of line-and-space patterns, and DOF margin of trench patterns.
- the invention provides a monomer having the general formula (1).
- R 1 is hydrogen, methyl or trifluoromethyl
- R 2 and R 3 are each independently a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms
- R 2 and R 3 may bond together to form a ring with the carbon atom to which they are attached
- R 4 to R 9 are each independently hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms
- R 4 and R 8 may bond together to form a 5 or 6-membered ring with the carbon atoms to which they are attached
- R 10 is a straight, branched or cyclic monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms
- a 1 is a straight, branched or cyclic divalent hydrocarbon group of 1 to 10 carbon atoms
- k 1 is 0 or 1
- n 1A is an integer of 0 to 2.
- the invention provides a monomer having the general formula (2).
- R 1 is hydrogen, methyl or trifluoromethyl
- R 10 is a straight, branched or cyclic monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms
- R 11 is hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms
- Z 1 forms a C 5 -C 15 alicyclic group with the carbon atom to which it is attached
- a 2 is methylene or ethylene.
- the invention provides a polymer comprising recurring units having the general formula (3a) or (3b).
- R 1 to R 11 , Z 1 , A 1 , A 2 , k 1 , and n 1A are as defined above.
- the polymer may further comprise recurring units of at least one type selected from recurring units having the general formulae (4A) to (4E).
- R 1 is as defined above, XA is an acid labile group, XB and XC are each independently a single bond or a straight or branched, divalent hydrocarbon group of 1 to 4 carbon atoms, XD is a straight, branched or cyclic, di- to pentavalent aliphatic hydrocarbon group of 1 to 16 carbon atoms in which a constituent —CH 2 — may be substituted by —O— or —C( ⁇ O)—, XE is an acid labile group, YA is a substituent group of lactone, sultone or carbonate structure, ZA is hydrogen, a fluoroalkyl group of 1 to 15 carbon atoms or a fluoroalcohol-containing group of 1 to 15 carbon atoms, k 1A is an integer of 1 to 3, and k 1B is an integer of 1 to 4.
- the polymer may further comprise recurring units of at least one type selected from sulfonium salt units (d1) to (d3) represented by the following general formula.
- R 20 , R 24 , and R 28 each are hydrogen or methyl;
- R 21 is a single bond, phenylene, —O—R 33 —, or —C( ⁇ O)—Y—R 33 —, wherein Y is oxygen or NH and R 33 is a straight, branched or cyclic C 1 -C 6 alkylene or alkenylene group or phenylene group, which may contain a carbonyl (—CO—), ester (—COO—), ether (—O—), or hydroxyl moiety;
- R 22 , R 23 , R 25 , R 26 , R 27 , R 29 , R 30 , and R 31 are each independently a straight, branched or cyclic C 1 -C 12 alkyl group which may contain a carbonyl, ester or ether moiety, a C 6 -C 12 aryl group, a C 7 -C 20 aralkyl group, or a thiophenyl group;
- the invention provides a process for forming a pattern by applying a resist composition comprising the polymer defined above and an acid generator onto a substrate, baking the composition to form a resist film, exposing the resist film to high-energy radiation to define exposed and unexposed regions, baking, and applying an organic solvent developer to the coated substrate to form a negative pattern wherein the unexposed region of resist film is dissolved and the exposed region of resist film is not dissolved.
- the invention provides a process for forming a pattern by applying a resist composition comprising the polymer comprising sulfonium salt units (d1) to (d3) onto a substrate, baking the composition to form a resist film, exposing the resist film to high-energy radiation to define exposed and unexposed regions, baking, and applying an organic solvent developer to the coated substrate to form a negative pattern wherein the unexposed region of resist film is dissolved and the exposed region of resist film is not dissolved.
- the developer comprises at least one organic solvent selected from the group consisting of 2-octanone, 2-nonanone, 2-heptanone, 3-heptanone, 4-heptanone, 2-hexanone, 3-hexanone, diisobutyl ketone, methylcyclohexanone, acetophenone, methylacetophenone, propyl acetate, butyl acetate, isobutyl acetate, amyl acetate, isoamyl acetate, butenyl acetate, propyl formate, butyl formate, isobutyl formate, amyl formate, isoamyl formate, methyl valerate, methyl pentenoate, methyl crotonate, ethyl crotonate, methyl propionate, ethyl propionate, ethyl 3-ethoxypropionate, methyl lactate, ethyl lactate, propyl lactate,
- the step of exposing the resist film to high-energy radiation includes KrF excimer laser lithography of wavelength 248 nm, ArF excimer laser lithography of wavelength 193 nm, EUV lithography of wavelength 13.5 nm or EB lithography.
- the process involves the steps of applying the resist composition onto a substrate, baking the composition to form a resist film, forming a protective film on the resist film, exposing the resist film to high-energy radiation to define exposed and unexposed regions, baking, and applying an organic solvent developer to the coated substrate to form a negative pattern wherein the unexposed region of resist film is dissolved and the exposed region of resist film is not dissolved.
- the invention provides a negative pattern-forming resist composition
- a negative pattern-forming resist composition comprising the polymer defined above, an acid generator, and an organic solvent, the resist composition being dissolvable in an organic solvent developer selected from the same group as defined above.
- the acid generator may be omitted when the polymer comprises sulfonium salt units (d1) to (d3).
- a photoresist film comprising a polymer comprising recurring units derived from the inventive monomer and an acid generator is used to form images via positive/negative reversal by organic solvent development. It displays a high dissolution contrast between the unexposed region of promoted dissolution and the exposed region of inhibited dissolution during organic solvent development. Through exposure and organic solvent development, the photoresist film can form a fine hole pattern at a high precision of dimensional control, or a trench pattern having high resolution and minimal roughness.
- FIG. 1 schematically illustrates in cross-sectional views the pattern forming process of the invention
- FIG. 1A shows a photoresist film formed on a substrate
- FIG. 1B shows the photoresist film being exposed
- FIG. 1C shows the photoresist film being developed in organic solvent.
- Cn-Cm means a group containing from n to m carbon atoms per group.
- EUV extreme ultraviolet
- Mw/Mn molecular weight distribution or dispersity
- PEB post-exposure bake
- the invention provides a monomer having the general formula (1).
- R 1 is hydrogen, methyl or trifluoromethyl.
- R 2 and R 3 are each independently a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. R 2 and R 3 may bond together to form a ring with the carbon atom to which they are attached.
- R 4 to R 9 are each independently hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. R 4 and R 8 may bond together to form a 5 or 6-membered ring with the carbon atoms to which they are attached.
- R 10 is a straight, branched or cyclic monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms.
- a 1 is a straight, branched or cyclic divalent hydrocarbon group of 1 to 10 carbon atoms
- k 1 is 0 or 1
- n 1A is an integer of 0 to 2.
- Typical straight, branched or cyclic, monovalent C 1 -C 10 hydrocarbon groups represented by R 2 to R 9 are alkyl groups including methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, cyclopentyl, cyclohexyl, 2-ethylhexyl, n-octyl, norbornyl, tricyclodecanyl, and adamantyl.
- R 2 and R 3 bond together to form a ring, examples of which are shown below.
- R 4 and R 8 bond together to form a 5 or 6-membered ring, examples of which are shown below wherein R 10 is as defined above.
- Typical straight, branched or cyclic, monovalent C 1 -C 10 hydrocarbon groups represented by R 10 are alkyl groups including methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, tert-amyl, n-pentyl, n-hexyl, n-octyl, n-nonyl, n-decyl, cyclopentyl, cyclohexyl, 2-ethylhexyl, cyclopentylmethyl, cyclopentylethyl, cyclopentylbutyl, cyclohexylmethyl, cyclohexylethyl, cyclohexylbutyl, norbornyl, oxanorbornyl, tricyclo[5.2.1.0 2,6 ]decanyl, and adamantyl.
- Typical straight, branched or cyclic, monovalent C 1 -C 10 fluorinated hydrocarbon groups represented by R 10 are fluoroalkyl groups, examples of which are shown below.
- Typical straight, branched or cyclic, divalent C 1 -C 10 hydrocarbon groups represented by A 1 are alkylene groups, examples of which are shown below.
- a second embodiment of the invention is a monomer having the general formula (2).
- R 1 is hydrogen, methyl or trifluoromethyl.
- R 10 is a straight, branched or cyclic, monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms.
- R 11 is hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms.
- Z 1 forms a C 5 -C 15 alicyclic group with the carbon atom to which it is attached.
- a 2 is methylene or ethylene.
- Typical straight, branched or cyclic, monovalent C 1 -C 10 hydrocarbon groups represented by R 11 are alkyl groups including methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, tert-amyl, n-pentyl, n-hexyl, n-octyl, n-nonyl, n-decyl, cyclopentyl, cyclohexyl, 2-ethylhexyl, cyclopentylmethyl, cyclopentylethyl, cyclopentylbutyl, cyclohexylmethyl, cyclohexylethyl, cyclohexylbutyl, norbornyl, oxanorbornyl, tricyclo[5.2.1.0 2,6 ]decanyl, and adamantyl.
- the monomer of formula (1) may be prepared, for example, via steps i) to iv) according to the reaction scheme shown below although the synthesis route is not limited thereto.
- R 1 to R 10 , A 1 , N 1A , and k 1 are as defined above.
- R 12 is a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms.
- X 1 is a halogen atom, hydroxyl group or —OR 13 wherein R 13 is methyl, ethyl or a group of the following formula (14).
- X 2 is a halogen atom, hydroxyl group or —OR 14 wherein R 14 is methyl, ethyl or a group of the following formula (15).
- Step i) is an addition reaction of a formyl or keto group of oxo-ester compound (5) with hydride reducing/organometallic reagent (6) to form hydroxy-ester compound (7).
- Suitable hydride reducing reagents include sodium borohydride, lithium borohydride, lithium aluminum hydride, and diisobutylaluminum hydride. Of these, sodium borohydride is preferred for the purpose of selectively reducing only the formyl or keto group of oxo-ester compound (5).
- the organometallic reagent may be selected from Grignard reagents, organolithium reagents, and organozinc reagents.
- the organometallic reagent when used, it is preferred for the purpose of selectively effecting addition reaction to the formyl or keto group of oxo-ester compound (5) that the amount of the organometallic reagent is 1.0 to 2.0 moles, specifically 1.0 to 1.2 moles per mole of oxo-ester compound (5). More than 2 moles of the organometallic reagent may result in a substantial drop of percent yield because addition reaction to an ester group of oxo-ester compound (5) may also take place to form a noticeable amount of by-product.
- reaction time is determined as appropriate by monitoring the reaction process by thin-layer chromatography (TLC) or gas chromatography (GC) because it is desirable from the yield aspect to drive the reaction to completion. Usually the reaction time is about 30 minutes to about 40 hours. Hydroxy-ester compound (7) may be recovered from the reaction mixture by ordinary aqueous work-up. If necessary, the compound may be purified by standard techniques like distillation, recrystallization and chromatography.
- Step ii) is a reaction of hydroxy-ester compound (7) with organometallic reagents (8) and (9) to form diol compound (10).
- the reaction may readily run by a well-known procedure.
- the organometallic reagents (8) and (9) may be selected from Grignard reagents, organolithium reagents, and organozinc reagents.
- the organometallic reagents (8) and (9), each one mole equivalent, are reacted in sequence with the ester group of hydroxy-ester compound (7) to form diol compound (10).
- diol compound (10) can be formed by reacting two mole equivalents of the organometallic reagent with the ester group of hydroxy-ester compound (7). This is advantageous for saving the number of steps.
- organometallic reagents (8) and (9) used is each 2.0 to 10 moles, more preferably 2.0 to 5.0 moles per mole of hydroxy-ester compound (7). Less than 2.0 moles of the organometallic reagent (8) or (9) may be insufficient to drive addition reaction to the ester group, resulting in a substantial drop of percent yield. More than 10 moles of the organometallic reagent (8) or (9) may be uneconomical because of an increase of reactant cost and a lowering of pot yield.
- the reaction time is determined as appropriate by monitoring the reaction process by TLC or GC because it is desirable from the yield aspect to drive the reaction to completion. Usually the reaction time is about 30 minutes to about 40 hours.
- Diol compound (10) may be recovered from the reaction mixture by ordinary aqueous work-up. If necessary, the compound may be purified by standard techniques like distillation, recrystallization and chromatography.
- Step iii) is a reaction of diol compound (10) with esterifying agent (11) to form hydroxy-ester compound (12).
- the reaction may readily run by a well-known procedure.
- the preferred esterifying agent (11) is an acid chloride of formula (11) wherein X 1 is chlorine or a carboxylic anhydride of formula (11) wherein X 1 is ⁇ OR 13 and R 13 is a group of the following formula (14).
- the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding diol compound (10), acid chloride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating.
- a solvent e.g., methylene chloride, acetonitrile, toluene or hexane
- a base e.g., triethylamine, pyridine or 4-dimethylaminopyridine
- the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding diol compound (10), carboxylic anhydride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating.
- a solvent e.g., methylene chloride, acetonitrile, toluene or hexane
- a base e.g., triethylamine, pyridine or 4-dimethylaminopyridine
- diol compound (10) used is 1 to 10 moles, more preferably 1 to 5 moles per mole of esterifying agent (11). Less than 1 mole of diol compound (10) may result in a substantial drop of percent yield because a noticeable amount of a bis-ester compound may be formed by side reaction to esterify both the hydroxyl groups of diol compound (10). More than 10 moles of diol compound (10) may be uneconomical because of an increase of reactant cost and a lowering of pot yield.
- reaction time is determined as appropriate by monitoring the reaction process by TLC or GC because it is desirable from the yield aspect to drive the reaction to completion. Usually the reaction time is about 30 minutes to about 40 hours. Hydroxy-ester compound (12) may be recovered from the reaction mixture by ordinary aqueous work-up. If necessary, the compound may be purified by standard techniques like distillation, recrystallization and chromatography.
- Step iv) is a reaction of hydroxy-ester compound (12) with esterifying agent (13) to form the desire monomer (1).
- the reaction may readily run by a well-known procedure.
- the preferred esterifying agent (13) is an acid chloride of formula (13) wherein X 2 is chlorine or a carboxylic anhydride of formula (13) wherein X 2 is ⁇ OR 14 and R 14 is a group of the following formula (15).
- the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding hydroxy-ester compound (12), acid chloride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating.
- a solvent e.g., methylene chloride, acetonitrile, toluene or hexane
- a base e.g., triethylamine, pyridine or 4-dimethylaminopyridine
- the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding hydroxy-ester compound (12), carboxylic anhydride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating.
- a solvent e.g., methylene chloride, acetonitrile, toluene or hexane
- a base e.g., triethylamine, pyridine or 4-dimethylaminopyridine
- the reaction may be conducted by heating hydroxy-ester compound (12) and carboxylic acid such as methacrylic acid in a solvent (e.g., toluene or hexane) in the presence of an acid catalyst while water formed during reaction may be removed out of the system if desired.
- a solvent e.g., toluene or hexane
- Suitable acid catalysts used herein include mineral acids such as hydrochloric acid, sulfuric acid, nitric acid and perchloric acid and organic acids such as p-toluenesulfonic acid and benzenesulfonic acid.
- the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding hydroxy-ester compound (12), acid anhydride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating.
- a solvent e.g., methylene chloride, acetonitrile, toluene or hexane
- a base e.g., triethylamine, pyridine or 4-dimethylaminopyridine
- the reaction time is determined as appropriate by monitoring the reaction process by TLC or GC because it is desirable from the yield aspect to drive the reaction to completion. Usually the reaction time is about 30 minutes to about 48 hours.
- the monomer (1) may be recovered from the reaction mixture by ordinary aqueous work-up. If necessary, the monomer may be purified by standard techniques like distillation, recrystallization and chromatography.
- a third embodiment of the invention is a polymer or high-molecular-weight compound comprising recurring units derived from the monomer having formula (1) or (2) defined above.
- the recurring units derived from the monomer having formula (1) or (2) are units having the general formula (3a) or (3b).
- R 1 is hydrogen, methyl or trifluoromethyl.
- R 2 and R 3 are each independently a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. R 2 and R 3 may bond together to form a ring with the carbon atom to which they are attached.
- R 4 to R 9 are each independently hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. R 4 and R 8 may bond together to form a 5 or 6-membered ring with the carbon atoms to which they are attached.
- R 10 is a straight, branched or cyclic monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms.
- R 11 is hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms.
- Z 1 forms a C 5 -C 15 alicyclic group with the carbon atom to which it is attached.
- a 1 is a straight, branched or cyclic divalent hydrocarbon group of 1 to 10 carbon atoms.
- a 2 is methylene or ethylene, k 1 is 0 or 1, and n 1A is an integer of 0 to 2.
- the inventive polymer serving as base resin in the resist composition has, as a side chain, an acid labile tertiary alkyl ester structure substituted with an acyloxy group. Since the tertiary alkyl group is highly lipophilic and the acyloxy group has high affinity to organic solvent developer, it is expected that the unexposed region of resist film is smoothly dissolved during organic solvent development to form a negative pattern. On the other hand, in the exposed region of resist film, deprotection reaction takes place under the action of generated acid, forming highly polar, hydrophilic carboxyl groups which serve to significantly reduce the solubility of the resist film in organic solvent developer so that the exposed region of resist film becomes insoluble in the developer. Therefore, the resist composition comprising the inventive polymer as base resin is expected to achieve a high dissolution contrast of the base resin before and after exposure, and improvements in resolution and roughness.
- the acid labile unit of the polymer must have a structure in which the substitution position of the pendant acyloxy is separated at least two carbons from the quaternary carbon to which the backbone acyloxy is attached.
- the polymer (3aa) has an acylated 1,3-diol structure which includes the backbone acyloxy group attached to the quaternary carbon (black circle) and the pendant acyloxy group located at the •-position (separated two carbons from the black-circled carbon) relative to the quaternary carbon.
- the polymer is expected to undergo fast deprotection reaction under the action of generated acid, which probably entails carbocation formation and ensuing olefin formation.
- the polymer (3c) has an acylated 1,2-diol structure which includes the backbone acyloxy group attached to the quaternary carbon (black circle) and the pendant acyloxy group located at the ⁇ -position (separated one carbon from the black-circled carbon) relative to the quaternary carbon.
- the polymer (3c) may undergo slow deprotection reaction and have insufficient acid reactivity because the electronegative acyloxy substituent is unstable in vicinity to the carbocation generated by acid.
- R 1 to R 5 and R 8 to R 10 are as defined above, R 3ba and R 3bb each are hydrogen or a monovalent hydrocarbon group.
- the preferred polymer may further comprise recurring units of at least one type selected from recurring units having the general formulae (4A) to (4E).
- R 1 is as defined above.
- XA is an acid labile group.
- XB and XC are each independently a single bond or a straight or branched, divalent hydrocarbon group of 1 to 4 carbon atoms.
- XD is a straight, branched or cyclic, di- to pentavalent aliphatic hydrocarbon group of 1 to 16 carbon atoms in which a constituent —CH 2 — may be substituted by —O— or —C( ⁇ O)—.
- XE is an acid labile group.
- YA is a substituent group of lactone, sultone or carbonate structure.
- ZA is hydrogen, a fluoroalkyl group of 1 to 15 carbon atoms or a fluoroalcohol-containing group of 1 to 15 carbon atoms
- k 1A is an integer of 1 to 3
- k 1B is an integer of 1 to 4.
- a polymer comprising recurring units of formula (4A) is decomposed under the action of acid to generate carboxylic acid so that it may turn alkali soluble.
- the acid labile group XA may be selected from a variety of such groups. Examples of the acid labile group are groups of the following general formulae (L1) to (L4), tertiary alkyl groups of 4 to 20 carbon atoms, preferably 4 to 15 carbon atoms, trialkylsilyl groups in which each alkyl moiety has 1 to 6 carbon atoms, and oxoalkyl groups of 4 to 20 carbon atoms.
- R L01 and R L02 are each independently hydrogen or a straight, branched or cyclic alkyl group of 1 to 18 carbon atoms, preferably 1 to 10 carbon atoms.
- R L03 is a monovalent hydrocarbon group of 1 to 18 carbon atoms, preferably 1 to 10 carbon atoms, which may contain a heteroatom such as oxygen, examples of which include straight, branched or cyclic alkyl groups, substituted forms of such alkyl groups in which some hydrogen atoms are replaced by hydroxyl, alkoxy, oxo, amino, alkylamino or the like, and similar groups which are separated by ether oxygen.
- R L04 is a tertiary alkyl group of 4 to 20 carbon atoms, preferably 4 to 15 carbon atoms, a trialkylsilyl group in which each alkyl moiety has 1 to 6 carbon atoms, an oxoalkyl group of 4 to 20 carbon atoms, or a group of formula (L1).
- R L05 is an optionally substituted, straight, branched or cyclic C 1 -C 10 alkyl group or an optionally substituted C 6 -C 20 aryl group.
- R L06 is an optionally substituted, straight, branched or cyclic C 1 -C 10 alkyl group or an optionally substituted C 6 -C 20 aryl group.
- R L07 to R L16 independently represent hydrogen or optionally substituted monovalent hydrocarbon groups of 1 to 15 carbon atoms.
- Letter y is an integer of 0 to 6, m is equal to 0 or 1, n is equal to 0, 1, 2 or 3, and 2 m+n is equal to 2 or 3.
- exemplary groups of R L01 and R L02 include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, cyclopentyl, cyclohexyl, 2-ethylhexyl, n-octyl, and adamantyl.
- R L03 is a monovalent hydrocarbon group of 1 to 18 carbon atoms, preferably 1 to 10 carbon atoms, which may contain a heteroatom such as oxygen, examples of which include straight, branched or cyclic alkyl groups, substituted forms of such alkyl groups in which some hydrogen atoms are replaced by hydroxyl, alkoxy, oxo, amino, alkylamino or the like, and similar groups which are separated by ether oxygen.
- Illustrative examples of the straight, branched or cyclic alkyl groups are as exemplified above for R L01 and R L02 , and examples of the substituted alkyl groups are as shown below.
- R L01 and R L02 , R L01 and R L03 , or R L02 and R L03 may bond together to form a ring with the carbon and oxygen atoms to which they are attached.
- Each of ring-forming R L01 , R L02 and R L03 is a straight or branched alkylene group of 1 to 18 carbon atoms, preferably 1 to 10 carbon atoms when they form a ring.
- exemplary tertiary alkyl groups of R L04 are tert-butyl, tert-amyl, 1,1-diethylpropyl, 2-cyclopentylpropan-2-yl, 2-cyclohexylpropan-2-yl, 2-(bicyclo[2.2.1]heptan-2-yl)propan-2-yl, 2-(adamantan-1-yl)-propan-2-yl, 1-ethylcyclopentyl, 1-butylcyclopentyl, 1-ethylcyclohexyl, 1-butylcyclohexyl, 1-ethyl-2-cyclopentenyl, 1-ethyl-2-cyclohexenyl, 2-methyl-2-adamantyl, 2-ethyl-2-adamantyl, and the like.
- Exemplary trialkylsilyl groups are trimethylsilyl, triethylsilyl, and dimethyl-tert-butylsilyl.
- Exemplary oxoalkyl groups are 3-oxocyclohexyl, 4-methyl-2-oxooxan-4-yl, and 5-methyl-2-oxooxolan-5-yl.
- examples of the optionally substituted C 1 -C 10 alkyl groups of R L05 include straight, branched or cyclic alkyl groups such as methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, tert-amyl, n-pentyl, n-hexyl, cyclopentyl, cyclohexyl, and bicyclo[2.2.1]heptyl, and substituted forms of such groups in which some hydrogen atoms are replaced by hydroxyl, alkoxy, carboxyl, alkoxycarbonyl, oxo, amino, alkylamino, cyano, mercapto, alkylthio, sulfo or other groups or in which a methylene moiety is replaced by an oxygen or sulfur atom.
- optionally substituted C 6 -C 20 aryl groups include phenyl, methylphenyl,
- Exemplary C 1 -C 15 monovalent hydrocarbon groups of R L07 to R L16 include straight, branched or cyclic alkyl groups such as methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, tert-amyl, n-pentyl, n-hexyl, n-octyl, n-nonyl, n-decyl, cyclopentyl, cyclohexyl, cyclopentylmethyl, cyclopentylethyl, cyclopentylbutyl, cyclohexylmethyl, cyclohexylethyl and cyclohexylbutyl, and substituted forms of these groups in which some hydrogen atoms are replaced by hydroxyl, alkoxy, carboxyl, alkoxycarbonyl, oxo, amino, alkylamino, cyano,
- R L07 to R L16 may bond together to form a ring with the carbon atom(s) to which they are attached (for example, a pair of R L07 and R L08 , R L07 and R L09 , R L08 and R L10 , R L09 and R L10 , R L11 and R L12 , or R L13 and R L14 form a ring).
- Each of R L07 to R L16 represents a C 1 -C 15 divalent hydrocarbon group, typically alkylene, when they form a ring, examples of which are those exemplified above for the monovalent hydrocarbon groups, with one hydrogen atom being eliminated.
- R L07 to R L16 which are attached to vicinal carbon atoms may bond together directly to form a double bond (for example, a pair of R L07 and R L09 , R L09 and R L15 , or R L13 and R L15 ).
- the cyclic ones are, for example, tetrahydrofuran-2-yl, 2-methyltetrahydrofuran-2-yl, tetrahydropyran-2-yl, and 2-methyltetrahydropyran-2-yl.
- Examples of the acid labile groups of formula (L2) include tert-butoxycarbonyl, tert-butoxycarbonylmethyl, tert-amyloxycarbonyl, tert-amyloxycarbonylmethyl, 1,1-diethylpropyloxycarbonyl, 1,1-diethylpropyloxycarbonylmethyl, 1-ethyl cyclopentyloxycarbonyl, 1-ethylcyclopentyloxycarbonylmethyl, 1-ethyl-2-cyclopentenyloxycarbonyl, 1-ethyl-2-cyclopentenyloxycarbonylmethyl, 1-ethoxyethoxycarbonylmethyl, 2-tetrahydropyranyloxycarbonylmethyl, and 2-tetrahydrofuranyloxycarbonylmethyl.
- Examples of the acid labile groups of formula (L3) include 1-methylcyclopentyl, 1-ethylcyclopentyl, 1-n-propylcyclopentyl, 1-isopropylcyclopentyl, 1-n-butylcyclopentyl, 1-sec-butylcyclopentyl, 1-cyclohexylcyclopentyl, 1-(4-methoxy-n-butyl)cyclopentyl, 1-(bicyclo[2.2.1]heptan-2-yl)cyclopentyl, 1-(7-oxabicyclo[2.2.1]heptan-2-yl)cyclopentyl, 1-methylcyclohexyl, 1-ethylcyclohexyl, 3-methyl-1-cyclopenten-3-yl, 3-ethyl-1-cyclopenten-3-yl, 3-methyl-1-cyclohexen-3-yl, and 3-ethyl-1-cyclohexen-3-yl.
- R L41 is each independently a monovalent hydrocarbon group, typically a straight, branched or cyclic C 1 -C 10 alkyl group, such as methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, tert-amyl, n-pentyl, n-hexyl, cyclopentyl and cyclohexyl.
- the general formula (L4-3) represents one or a mixture of two selected from groups having the following general formulas (L4-3-1) and (L4-3-2).
- R L41 is as defined above.
- the general formula (L4-4) represents one or a mixture of two or more selected from groups having the following general formulas (L4-4-1) to (L4-4-4).
- R L41 is as defined above.
- Each of formulas (L4-1) to (L4-4), (L4-3-1) and (L4-3-2), and (L4-4-1) to (L4-4-4) collectively represents an enantiomer thereof and a mixture of enantiomers.
- R L41 is as defined above.
- Examples of the tertiary C 4 -C 20 alkyl groups, trialkylsilyl groups in which each alkyl moiety has 1 to 6 carbon atoms, and C 4 -C 20 oxoalkyl groups, represented by XA, are as exemplified for R L04 and the like.
- a polymer comprising recurring units of formula (4E) is decomposed under the action of acid to generate a hydroxyl group so that its solubility in various solvents may change.
- the acid labile group XE may be selected from a variety of such groups. Examples of the acid labile group XE are groups of formulae (L1) to (L4), tertiary alkyl groups of 4 to 20 carbon atoms, trialkylsilyl groups in which each alkyl moiety has 1 to 6 carbon atoms, and oxoalkyl groups of 4 to 20 carbon atoms, like the acid labile group XA mentioned above.
- the polymer may have further copolymerized therein any of recurring units (d1) to (d3) of sulfonium salt represented by the following general formulae.
- R 20 , R 24 and R 28 each are hydrogen or methyl.
- R 21 is a single bond, phenylene, —O—R 33 —, or —C( ⁇ O)—Y—R 33 — wherein Y is oxygen or NH and R 33 is a straight, branched or cyclic C 1 -C 6 alkylene or alkenylene group or phenylene group, which may contain a carbonyl (—CO—), ester (—COO—), ether (—O—) or hydroxyl moiety.
- R 22 , R 23 , R 25 , R 26 , R 27 , R 29 , R 30 , and R 31 are each independently a straight, branched or cyclic C 1 -C 12 alkyl group which may contain a carbonyl, ester or ether moiety, or a C 6 -C 12 aryl group, C 7 -C 20 aralkyl group, or thiophenyl group.
- Z 0 is a single bond, methylene, ethylene, phenylene, fluorinated phenylene, —O—R 32 —, or —C( ⁇ O)—Z 1 —R 32 — wherein Z 1 is oxygen or NH and R 32 is a straight, branched or cyclic C 1 -C 6 alkylene or alkenylene group or phenylene group, which may contain a carbonyl, ester, ether or hydroxyl moiety.
- M ⁇ is a non-nucleophilic counter ion.
- the polymer may further comprise recurring units derived from carbon-to-carbon double bond-bearing monomers other than the above-described ones, for example, substituted acrylic acid esters such as methyl methacrylate, methyl crotonate, dimethyl maleate and dimethyl itaconate, unsaturated carboxylic acids such as maleic acid, fumaric acid, and itaconic acid, cyclic olefins such as norbornene, norbornene derivatives, and tetracyclo[4.4.0.1 2,5 .1 7,10 ]dodecene derivatives, unsaturated acid anhydrides such as itaconic anhydride, and other monomers.
- substituted acrylic acid esters such as methyl methacrylate, methyl crotonate, dimethyl maleate and dimethyl itaconate
- unsaturated carboxylic acids such as maleic acid, fumaric acid, and itaconic acid
- cyclic olefins such as norbornene, norbornen
- the polymer should preferably have a weight average molecular weight (Mw) in the range of 1,000 to 500,000, and more preferably 3,000 to 100,000, as measured versus polystyrene standards by GPC using tetrahydrofuran solvent. Outside the range, there may result an extreme drop of etch resistance, and a drop of resolution due to difficulty to gain a dissolution rate difference before and after exposure.
- Mw weight average molecular weight
- the recurring units derived from the inventive monomer and other monomers are preferably incorporated in the following molar fractions (mol %):
- the inventive polymer may be prepared by copolymerization reaction using the compound of formula (1) or (2) as a first monomer and polymerizable double bond-bearing compounds as second and subsequent monomers, which provide recurring units having formulae (4A) to (4E) and (d1) to (d3) and the like.
- the copolymerization reaction to produce the inventive polymer may be performed in various modes, preferably radical polymerization, anionic polymerization or coordination polymerization.
- reaction conditions include (a) a solvent selected from among hydrocarbons such as benzene, ethers such as tetrahydrofuran, alcohols such as ethanol, and ketones such as methyl isobutyl ketone, (b) a polymerization initiator selected from azo compounds such as 2,2′-azobisisobutyronitrile and peroxides such as benzoyl peroxide and lauroyl peroxide, (c) a temperature of about 0° C. to about 100° C., and (d) a time of about 0.5 hour to about 48 hours. Reaction conditions outside the described range may be employed if desired.
- a solvent selected from among hydrocarbons such as benzene, ethers such as tetrahydrofuran, alcohols such as ethanol, and ketones such as methyl isobutyl ketone
- a polymerization initiator selected from azo compounds such as 2,2′-azobisisobutyronitrile and peroxides such as be
- reaction conditions include (a) a solvent selected from among hydrocarbons such as benzene, ethers such as tetrahydrofuran, and liquid ammonia, (b) a polymerization initiator selected from metals such as sodium and potassium, alkyl metals such as n-butyl lithium and sec-butyl lithium, ketyl, and Grignard reagents, (c) a temperature of about ⁇ 78° C. to about 0° C., (d) a time of about 0.5 hour to about 48 hours, and (e) a stopper selected from among proton-donative compounds such as methanol, halides such as methyl iodide, and electrophilic compounds. Reaction conditions outside the described range may be employed if desired.
- a solvent selected from among hydrocarbons such as benzene, ethers such as tetrahydrofuran, and liquid ammonia
- a polymerization initiator selected from metals such as sodium and potassium, alkyl metals such
- reaction conditions include (a) a solvent selected from among hydrocarbons such as n-heptane and toluene, (b) a catalyst selected from Ziegler-Natta catalysts comprising a transition metal (e.g., titanium) and alkylaluminum, Phillips catalysts of metal oxides having chromium or nickel compounds carried thereon, and olefin-metathesis mixed catalysts as typified by tungsten and rhenium mixed catalysts, (c) a temperature of about 0° C. to about 100° C., and (d) a time of about 0.5 hour to about 48 hours. Reaction conditions outside the described range may be employed if desired.
- a solvent selected from among hydrocarbons such as n-heptane and toluene
- a catalyst selected from Ziegler-Natta catalysts comprising a transition metal (e.g., titanium) and alkylaluminum, Phillips catalysts of metal oxides having chromium or nickel compounds carried thereon, and
- the polymer is useful as a base resin in a resist composition, especially for use in organic solvent development process.
- a further embodiment of the invention is a resist composition, typically chemically amplified resist composition comprising the polymer.
- the resist composition comprises the following components:
- the acid generator (B) may be omitted when the polymer has copolymerized therein recurring units (d1), (d2) or (d3).
- the base resin may be a blend of the inventive polymer with another polymer capable of increasing its dissolution rate in alkaline developer under the action of acid.
- Suitable other polymers include, but are not limited to, (i) poly(meth)acrylate derivatives, (ii) norbornene derivative-maleic anhydride copolymers, (iii) hydrogenated products of ring-opening metathesis polymerization (ROMP) polymers, and (iv) vinyl ether-maleic anhydride-(meth)acrylate derivative copolymers.
- the inventive polymer and the other polymer are preferably blended in a weight ratio between 100:0 and 10:90, more preferably between 100:0 and 20:80. If the ratio of the inventive polymer is less than the range, the resist composition may fail to exert the desired characteristics. The characteristics of the resist composition may be adjusted by changing the blending ratio.
- the characteristics of the resist composition may be adjusted by using a plurality of inventive polymers.
- Typical of the acid generator used herein is a photoacid generator (PAG).
- the PAG is any compound capable of generating an acid upon exposure to high-energy radiation.
- Suitable PAGs include sulfonium salts, iodonium salts, sulfonyldiazomethane, N-sulfonyloxyimide, and oxime-O-sulfonate acid generators. Examples of these PAGs are described in JP-A 2009-269953, paragraphs [0151] to [0156] (U.S. Pat. No. 8,114,571).
- an acid diffusion controlling function may be provided when two or more PAGs are used in admixture provided that one PAG is an onium salt capable of generating a weak acid.
- a PAG capable of generating a strong acid e.g., fluorinated sulfonic acid
- an onium salt capable of generating a weak acid e.g., non-fluorinated sulfonic acid or carboxylic acid
- a salt exchange occurs whereby the weak acid is released and an onium salt having a strong acid anion is formed.
- the strong acid is exchanged into the weak acid having a low catalysis, incurring apparent deactivation of the acid for enabling to control acid diffusion.
- the PAG capable of generating a strong acid is also an onium salt
- an exchange from the strong acid (generated upon exposure to high-energy radiation) to a weak acid as above can take place, but it never happens that the weak acid (generated upon exposure to high-energy radiation) collides with the unreacted onium salt capable of generating a strong acid to induce a salt exchange. This is because of a likelihood of an onium cation forming an ion pair with a stronger acid anion.
- An appropriate amount of PAG added is 0.1 to 40 parts, and more preferably 0.1 to 20 parts by weight per 100 parts by weight of the base resin (A) in the resist composition. As long as PAG is up to 40 parts, the resulting resist film has a fully high transmittance and a minimal likelihood of degraded resolution.
- the PAG may be used alone or in admixture of two or more.
- the transmittance of the resist film can be controlled by using a PAG having a low transmittance at the exposure wavelength and adjusting the amount of the PAG added.
- a compound which is decomposed with an acid to generate another acid that is, acid amplifier compound may be added.
- acid amplifier compound examples include tert-butyl-2-methyl-2-tosyloxymethyl acetoacetate and 2-phenyl-2-(2-tosyloxyethyl)-1,3-dioxolane, but are not limited thereto.
- PAGs PAG-like behavior.
- an appropriate amount of the acid amplifier compound is up to 2 parts, and especially up to 1 part by weight per 100 parts by weight of the base resin. Excessive amounts of the acid amplifier compound make diffusion control difficult, leading to degradation of resolution and pattern profile.
- Component (C) used herein may be any organic solvent as long as the base resin, acid generator and other components are dissolvable therein.
- organic solvents include ketones such as cyclohexanone and methyl amyl ketone; alcohols such as 3-methoxybutanol, 3-methyl-3-methoxybutanol, 1-methoxy-2-propanol, and 1-ethoxy-2-propanol; ethers such as propylene glycol monomethyl ether, ethylene glycol monomethyl ether, propylene glycol monoethyl ether, ethylene glycol monoethyl ether, propylene glycol dimethyl ether, and diethylene glycol dimethyl ether; esters such as propylene glycol monomethyl ether acetate (PGMEA), propylene glycol monoethyl ether acetate, ethyl lactate, ethyl pyruvate, butyl acetate, methyl 3-methoxypropionate, ethyl
- An appropriate amount of the organic solvent used is 200 to 1,000 parts, and especially 400 to 800 parts by weight per 100 parts by weight of the base resin.
- nitrogen-containing organic compounds may be used alone or in admixture. Those compounds capable of suppressing the rate of diffusion when the acid generated by the PAG diffuses within the resist film are useful. The inclusion of such quencher facilitates adjustment of resist sensitivity and holds down the rate of acid diffusion within the resist film, resulting in better resolution. In addition, it suppresses changes in sensitivity following exposure and mitigates substrate poisoning and environment dependence, as well as improving the exposure latitude and the pattern profile.
- Suitable nitrogen-containing organic compounds include primary, secondary, and tertiary aliphatic amines, mixed amines, aromatic amines, heterocyclic amines, nitrogen-containing compounds having carboxyl group, nitrogen-containing compounds having sulfonyl group, nitrogen-containing compounds having hydroxyl group, nitrogen-containing compounds having hydroxyphenyl group, alcoholic nitrogen-containing compounds, amide, imide and carbamate derivatives.
- Illustrative examples are described in JP-A 2009-269953, paragraphs [0122] to [0141].
- the basic compound is preferably used in an amount of 0.001 to 8 parts, more preferably 0.01 to 4 parts by weight per 100 parts by weight of the base resin. Less than 0.001 part fails to achieve the desired addition effect whereas more than 8 parts may lead to a lowering of sensitivity.
- the preferred nitrogen-containing organic compound is a compound capable of holding down the diffusion rate of acid when the acid generated by the acid generator diffuses in the resist film. The inclusion of the nitrogen-containing organic compound holds down the diffusion rate of acid in the resist film, which leads to many advantages including improved resolution, minimized sensitivity change following exposure, reduced substrate poisoning and environment dependency, and improved exposure latitude and pattern profile.
- nonionic surfactants are preferred. Suitable surfactants include perfluoroalkylpolyoxyethylene ethanols, fluorinated alkyl esters, perfluoroalkylamine oxides, perfluoroalkyl EO-addition products, and fluorinated organosiloxane compounds.
- Useful surfactants are commercially available under the trade names Fluorad FC-430 and FC-431 from Sumitomo 3M, Ltd., Surflon S-141, S-145, KH-10, KH-20, KH-30 and KH-40 from Asahi Glass Co., Ltd., Unidyne DS-401, DS-403 and DS-451 from Daikin Industry Co., Ltd., Megaface F-8151 from DIC Corp., and X-70-092 and X-70-093 from Shin-Etsu Chemical Co., Ltd.
- Preferred surfactants are Fluorad FC-430 from Sumitomo 3M, Ltd., KH-20 and KH-30 from Asahi Glass Co., Ltd., and X-70-093 from Shin-Etsu Chemical Co., Ltd.
- a polymer may be added to the resist composition of the invention which will segregate at the top of a coating and functions to adjust a hydrophilic/hydrophobic balance at the surface, to enhance water repellency, or to prevent low-molecular-weight components from flowing into or out of the coating when the coating comes in contact with water or similar liquids.
- the amount of functional polymer added is as used in resist compositions of this type as long as it does not compromise the objects of the invention, and is preferably up to 15 parts, and more preferably up to 10 parts by weight per 100 parts by weight of the base resin.
- Preferred examples of the functional polymer which will segregate at the coating top include polymers and copolymers comprising fluorinated units of one or more types, and copolymers comprising fluorinated units and other units.
- Illustrative examples of suitable fluorinated units and other units are shown below, but not limited thereto.
- the functional polymer which will segregate at the coating top should preferably have a Mw of 1,000 to 50,000, more preferably 2,000 to 20,000, as measured by GPC versus polystyrene standards. Outside the range, the polymer may have insufficient surface-modifying effect or cause development defects.
- the resist composition of the invention typically comprises a polymer, acid generator, organic solvent and organic nitrogen-containing compound as described above, there may be added optional other ingredients such as dissolution inhibitors, acidic compounds, stabilizers, and dyes. Optional ingredients may be added in conventional amounts so long as this does not compromise the objects of the invention.
- Pattern formation using the resist composition of the invention may be performed by well-known lithography processes.
- the process generally involves coating, heat treatment (or prebake), exposure, heat treatment (PEB), and development. If necessary, any additional steps may be added.
- FIG. 1 The process of forming a negative pattern using an organic solvent as developer is illustrated in FIG. 1 .
- the resist composition is coated on a substrate to form a resist film thereon.
- a resist film 40 of a resist composition is formed on a processable substrate 20 disposed on a substrate 10 directly or via an intermediate intervening layer 30 as shown in FIG. 1A .
- the resist film preferably has a thickness of 10 to 1,000 nm and more preferably 20 to 500 nm.
- the resist film is heated or prebaked, preferably at a temperature of 60 to 180° C., especially 70 to 150° C. for a time of 10 to 300 seconds, especially 15 to 200 seconds.
- the substrate 10 used herein is generally a silicon substrate.
- the processable substrate (or target film) 20 used herein includes SiO 2 , SiN, SiON, SiOC, p-Si, ⁇ -Si, TiN, WSi, BPSG, SOG, Cr, CrO, CrON, MoSi, low dielectric film, and etch stopper film.
- the intermediate intervening layer 30 includes hard masks of SiO 2 , SiN, SiON or p-Si, an undercoat in the form of carbon film, a silicon-containing intermediate film, and an organic antireflective coating.
- the exposure may be done either in a dry atmosphere such as air or nitrogen stream or by immersion lithography in water.
- the ArF immersion lithography uses deionized water or liquids having a refractive index of at least 1 and highly transparent to the exposure wavelength such as alkanes as the immersion solvent.
- the immersion lithography involves prebaking a resist film and exposing the resist film to light through a projection lens, with water introduced between the resist film and the projection lens.
- the immersion lithography is important for the ArF lithography to survive to the 45-nm node.
- deionized water rinsing (or post-soaking) may be carried out after exposure for removing water droplets left on the resist film, or a protective film may be applied onto the resist film after pre-baking for preventing any leach-out from the resist film and improving water slip on the film surface.
- the resist protective film used in the immersion lithography is preferably formed from a solution of a polymer having 1,1,1,3,3,3-hexafluoro-2-propanol residues which is insoluble in water, but soluble in an alkaline developer liquid, in a solvent selected from alcohols of at least 4 carbon atoms, ethers of 8 to 12 carbon atoms, and mixtures thereof. While the protective film must dissolve in the organic solvent developer, the polymer comprising recurring units derived from a monomer having a 1,1,1,3,3,3-hexafluoro-2-propanol residue dissolves in organic solvent developers.
- protective film-forming materials having 1,1,1,3,3,3-hexafluoro-2-propanol residues as described in JP-A 2007-025634, 2008-003569, 2008-81716, and 2008-111089 readily dissolve in organic solvent developers.
- an amine compound or amine salt or a polymer having copolymerized therein recurring units containing an amine group or amine salt may be used.
- This component is effective for controlling diffusion of the acid generated in the exposed region of the photoresist film to the unexposed region for thereby preventing any hole opening failure.
- Useful protective film materials having an amine compound added thereto are described in JP-A 2008-003569, and useful protective film materials having an amino group or amine salt copolymerized are described in JP-A 2007-316448.
- the amine compound or amine salt may be selected from the compounds enumerated as the basic compound to be added to the resist composition.
- An appropriate amount of the amine compound or amine salt added is 0.01 to 10 parts, preferably 0.02 to 8 parts by weight per 100 parts by weight of the base resin.
- deionized water rinsing may be carried out for extracting the acid generator and the like from the film surface or washing away particles, or after exposure, rinsing (or post-soaking) may be carried out for removing water droplets left on the resist film.
- acid evaporating from the exposed region during PEB deposits on the unexposed region to deprotect the protective group on the surface of the unexposed region, there is a possibility that the surface edges of holes after development are bridged to close the holes. Particularly in the case of negative development, regions surrounding the holes receive light so that acid is generated therein. There is a possibility that the holes are not opened if the acid outside the holes evaporates and deposits inside the holes during PEB.
- Provision of a protective film is effective for preventing evaporation of acid and for avoiding any hole opening failure.
- a protective film having an amine compound or amine salt added thereto is more effective for preventing acid evaporation.
- a protective film to which an acid compound such as a carboxyl or sulfo group is added or which is based on a polymer having copolymerized therein monomeric units containing a carboxyl or sulfo group is undesirable because of a potential hole opening failure.
- a further embodiment of the invention is a process for forming a pattern by applying a resist composition comprising a polymer comprising recurring units having formula (3a) or (3b), an acid generator, and an organic solvent onto a substrate, baking the composition to form a resist film, forming a protective film on the resist film, exposing the resist film to high-energy radiation to define exposed and unexposed regions, baking, and applying a developer to the coated substrate to form a negative pattern wherein the unexposed region of resist film and the protective film are dissolved and the exposed region of resist film is not dissolved.
- the protective film is preferably formed from a composition comprising a polymer bearing a 1,1,1,3,3,3-hexafluoro-2-propanol residue and an amino group or amine salt-containing compound, or a composition comprising a polymer bearing a 1,1,1,3,3,3-hexafluoro-2-propanol residue and having amino group or amine salt-containing recurring units copolymerized, the composition further comprising an alcohol solvent of at least 4 carbon atoms, an ether solvent of 8 to 12 carbon atoms, or a mixture thereof.
- those monomers having a —C(CF 3 ) (OH) group i.e., a carbon atom having CF 3 and OH radicals bonded thereto are preferably selected among the exemplary monomers listed for the recurring unit (4D) (some monomers on pages 50 and 51).
- the amino group-containing compound may be selected from the exemplary amine compounds (to be added to photoresist compositions) described in JP-A 2008-111103, paragraphs [0146] to [0164].
- the amine salt-containing compound salts of the foregoing amine compounds with carboxylic acid or sulfonic acid may be used.
- Suitable alcohols of at least 4 carbon atoms include 1-butyl alcohol, 2-butyl alcohol, isobutyl alcohol, tert-butyl alcohol, 1-pentanol, 2-pentanol, 3-pentanol, tert-amyl alcohol, neopentyl alcohol, 2-methyl-1-butanol, 3-methyl-1-butanol, 3-methyl-3-pentanol, cyclopentanol, 1-hexanol, 2-hexanol, 3-hexanol, 2,3-dimethyl-2-butanol, 3,3-dimethyl-1-butanol, 3,3-dimethyl-2-butanol, 2-ethyl-1-butanol, 2-methyl-1-pentanol, 2-methyl-2-pentanol, 2-methyl-3-pentanol, 3-methyl-1-pentanol, 3-methyl-2-pentanol, 3-methyl-3-pentanol, 4-methyl-1-pent
- Suitable ether solvents of 8 to 12 carbon atoms include di-n-butyl ether, diisobutyl ether, di-sec-butyl ether, di-n-pentyl ether, diisopentyl ether, di-sec-pentyl ether, di-t-amyl ether, and di-n-hexyl ether.
- Exposure is preferably performed in an exposure dose of about 1 to 200 mJ/cm 2 , more preferably about 10 to 100 mJ/cm 2 . This is followed by baking (PEB) on a hot plate at 60 to 150° C. for 1 to 5 minutes, preferably at 80 to 120° C. for 1 to 3 minutes.
- PEB baking
- the exposed resist film is developed in a developer consisting of an organic solvent for 0.1 to 3 minutes, preferably 0.5 to 2 minutes by any conventional techniques such as dip, puddle and spray techniques. In this way, the unexposed region of resist film was dissolved away, leaving a negative resist pattern 40 on the substrate 10 as shown in FIG. 1C .
- the developer used herein is preferably selected from among ketones such as 2-octanone, 2-nonanone, 2-heptanone, 3-heptanone, 4-heptanone, 2-hexanone, 3-hexanone, diisobutyl ketone, methylcyclohexanone, acetophenone, and methylacetophenone, and esters such as propyl acetate, butyl acetate, isobutyl acetate, amyl acetate, isoamyl acetate, butenyl acetate, propyl formate, butyl formate, isobutyl formate, amyl formate, isoamyl formate, methyl valerate, methyl pentenoate, methyl crotonate, ethyl crotonate, methyl propionate, ethyl propionate, ethyl 3-ethoxypropionate, methyl lactate, ethyl lactate, propyl lac
- the resist film is rinsed.
- a solvent which is miscible with the developer and does not dissolve the resist film is preferred.
- Suitable solvents include alcohols of 3 to 10 carbon atoms, ether compounds of 8 to 12 carbon atoms, alkanes, alkenes, and alkynes of 6 to 12 carbon atoms, and aromatic solvents.
- suitable alkanes of 6 to 12 carbon atoms include hexane, heptane, octane, nonane, decane, undecane, dodecane, methylcyclopentane, dimethylcyclopentane, cyclohexane, methylcyclohexane, dimethylcyclohexane, cycloheptane, cyclooctane, and cyclononane.
- Suitable alkenes of 6 to 12 carbon atoms include hexene, heptene, octene, cyclohexene, methylcyclohexene, dimethylcyclohexene, cycloheptene, and cyclooctene.
- Suitable alkynes of 6 to 12 carbon atoms include hexyne, heptyne, and octyne.
- Suitable alcohols of 3 to 10 carbon atoms include n-propyl alcohol, isopropyl alcohol, 1-butyl alcohol, 2-butyl alcohol, isobutyl alcohol, tert-butyl alcohol, 1-pentanol, 2-pentanol, 3-pentanol, tert-amyl alcohol, neopentyl alcohol, 2-methyl-1-butanol, 3-methyl-1-butanol, 3-methyl-3-pentanol, cyclopentanol, 1-hexanol, 2-hexanol, 3-hexanol, 2,3-dimethyl-2-butanol, 3,3-dimethyl-1-butanol, 3,3-dimethyl-2-butanol, 2-ethyl-1-butanol, 2-methyl-1-pentanol, 2-methyl-2-pentanol, 2-methyl-3-pentanol, 3-methyl-1-pentanol, 3-methyl-2-pentanol, 3-
- Suitable ether compounds of 8 to 12 carbon atoms include di-n-butyl ether, diisobutyl ether, di-sec-butyl ether, di-n-pentyl ether, diisopentyl ether, di-sec-pentyl ether, di-tert-amyl ether, and di-n-hexyl ether.
- Suitable aromatic solvents include toluene, xylene, ethylbenzene, isopropylbenzene, tert-butylbenzene, and mesitylene. The solvents may be used alone or in admixture.
- a hole pattern is formed by negative tone development using organic solvent developer
- exposure by double dipole illuminations of X- and Y-direction line patterns provides the highest contrast light.
- the contrast may be further increased by combining two dipole illuminations of X- and Y-direction line patterns with s-polarized illumination.
- a Grignard reagent was prepared from 114.3 g of 1,4-dichlorobutane, 43.8 g of metallic magnesium, and 900 g of THF.
- a solution of 72.1 g of the resulting Hydroxy-ester 1a in 100 g of THF was added dropwise to the Grignard reagent solution below 40° C.
- the reaction solution was stirred at room temperature for 4 hours, after which it was ice cooled.
- a mixed aqueous solution of ammonium chloride and 20% hydrochloric acid was added dropwise thereto to quench the reaction. This was followed by standard aqueous workup. After the solvent was distilled off, the product was purified by distillation, obtaining 72.4 g (yield 85%) of Diol 1.
- IR (D-ATR): ⁇ 3599, 3512, 2961, 2873, 1725, 1480, 1459, 1397, 1367, 1285, 1150, 1032, 995, 970, 937, 845, 772 cm ⁇ 1
- IR (D-ATR): ⁇ 2960, 2874, 1724, 1712, 1637, 1480, 1452, 1397, 1367, 1332, 1304, 1283, 1150, 1032, 1009, 972, 937, 815, 771, 653, 589, 573 cm ⁇ 1
- Diol 2 was synthesized by the same procedure as Synthesis Example 1-1-2 aside from using Hydroxy-ester 2a instead of Hydroxy-ester 1a. Amount 169 g, yield 92%.
- IR (D-ATR): ⁇ 3315, 2956, 2934, 2856, 1444, 1422, 1365, 1351, 1338, 1313, 1288, 1238, 1214, 1197, 1141, 1112, 1066, 1037, 989, 961, 943, 930, 904, 845, 817, 654 cm ⁇ 1
- Hydroxy-ester 2b was synthesized by the same procedure as Synthesis Example 1-1-3 aside from using 40.0 g of Diol 2 instead of Diol 1. The reaction solution of Hydroxy-ester 2b was used in the subsequent step without post-treatment.
- Methacryloyl chloride 40.8 g was added dropwise to the reaction solution of Hydroxy-ester 2b at 50-60° C., which was stirred at 50° C. for 12 hours.
- the reaction solution was ice cooled whereupon a saturated sodium hydrogencarbonate aqueous solution was added to quench the reaction. This was followed by standard aqueous workup. After the solvent was distilled off, the product was purified by silica gel chromatography, obtaining Monomer 2 (61.8 g, two-step yield 84%).
- IR (D-ATR): ⁇ 2954, 2870, 1724, 1713, 1637, 1480, 1448, 1397, 1377, 1331, 1303, 1284, 1162, 1096, 1037, 1007, 986, 934, 893, 815 cm ⁇ 1
- IR (D-ATR): ⁇ 3486, 2941, 2867, 1732, 1446, 1371, 1244, 1122, 1037, 1021, 993, 956, 931, 907, 896, 853, 823, 705, 606 cm ⁇ 1
- Monomer 3 was synthesized by the same procedure as Synthesis Example 1-1-4 aside from using Hydroxy-ester 3 instead of Hydroxy-ester 1b. Amount 107.3 g, yield 84%.
- IR (D-ATR): ⁇ 2946, 2868, 1733, 1707, 1636, 1448, 1401, 1370, 1331, 1302, 1243, 1157, 1097, 1037, 1020, 985, 953, 934, 909, 873, 849, 815, 653, 624, 606 cm ⁇ 1
- Diol 3 was synthesized by the same procedure as Synthesis Example 1-1-2 aside from using Hydroxy-ester 4a instead of Hydroxy-ester 1a. Amount 297 g, yield 80%.
- Hydroxy-ester 4b was synthesized by the same procedure as Synthesis Example 1-1-3 aside from using Diol 3 instead of Diol 1. Amount 123 g, yield 94%.
- Monomer 4 was synthesized by the same procedure as Synthesis Example 1-1-4 aside from using Hydroxy-ester 4b instead of Hydroxy-ester 1b. Amount 129 g, yield 81%.
- IR (D-ATR): ⁇ 2972, 2874, 1723, 1637, 1480, 1454, 1398, 1377, 1333, 1284, 1163, 1132, 1049, 937, 816, 771 cm ⁇ 1
- Diol 4 was synthesized by the same procedure as Synthesis Example 1-1-2 aside from using methylmagnesium chloride as Grignard reagent and Hydroxy-ester 4a instead of Hydroxy-ester 1a. Yield 83%.
- Hydroxy-ester 5 was synthesized by the same procedure as Synthesis Example 1-1-3 aside from using Diol 4 instead of Diol 1. Yield 96%.
- Monomer 5 was synthesized by the same procedure as Synthesis Example 1-1-4 aside from using Hydroxy-ester 5 instead of Hydroxy-ester 1b. Yield 79%.
- Monomer 6 was synthesized by the same procedure as Synthesis Example 1-1-4 aside from using methacryloyloxyacetyl chloride instead of methacryloyl chloride, and pyridine instead of triethylamine and 4-(dimethylamino)pyridine. Yield 80%.
- Monomer 7 was synthesized by the same procedure as Synthesis Example 1-1-4 aside from using acryloyl chloride instead of methacryloyl chloride. Yield 89%.
- Monomer 8 was synthesized by the same procedure as Synthesis Example 1-1-4 aside from using ⁇ -trifluoromethyacryloyl chloride instead of methacryloyl chloride, and pyridine instead of triethylamine and 4-(dimethylamino)pyridine. Yield 81%.
- Hydroxy-ester 6 was synthesized by the same procedure as Synthesis Example 1-3-1 aside from using Diol 1 instead of Dial 2, trifluoroacetic anhydride instead of acetic anhydride, and only pyridine. Yield 76%.
- Monomer 9 was synthesized by the same procedure as Synthesis Example 1-1-4 aside from using Hydroxy-ester 6 instead of Hydroxy-ester 1b. Yield 82%.
- Hydroxy-ester 7 was synthesized by the same procedure as Synthesis Example 1-3-1 aside from using 4-trifluoromethylcyclohexanecarbonyl chloride instead of acetic anhydride. Yield 80%.
- Monomer 10 was synthesized by the same procedure as Synthesis Example 1-1-4 aside from using Hydroxy-ester 7 instead of Hydroxy-ester 1b. Yield 85%.
- Comparative Monomer 1 was synthesized in accordance with the following scheme.
- Diol 5 was synthesized by the same procedure as Synthesis Example 1-1-2 aside from using Hydroxy-ester 8a instead of Hydroxy-ester 1a. Amount 43.3 g, yield 81%.
- Hydroxy-ester 8b was synthesized by the same procedure as Synthesis Example 1-1-3 aside from using Diol 5 instead of Diol 1. Amount 63.1 g, yield 93%.
- IR (D-ATR): ⁇ 3499, 2987, 2973, 2958, 2906, 2868, 1726, 1699, 1543, 1479, 1459, 1446, 1396, 1382, 1369, 1346, 1326, 1289, 1231, 1180, 1105, 1082, 1061, 1042, 989, 946, 908, 887, 863, 807, 773 cm ⁇ 1
- Comparative Monomer 1 was synthesized by the same procedure as Synthesis Example 1-1-4 aside from using Hydroxy-ester 8b instead of Hydroxy-ester 1b. Amount 71.1 g, yield 96%.
- IR (D-ATR): ⁇ 2975, 2874, 1732, 1717, 1638, 1480, 1455, 1397, 1380, 1329, 1304, 1283, 1150, 1067, 1035, 1009, 975, 940, 868, 815, 769 cm ⁇ 1
- the polymerization solution was cooled to room temperature, whereupon it was added dropwise to 1,200 g of methanol.
- the thus precipitated solids were filtered and dried in vacuum at 50° C. for 20 hours, obtaining a polymer in white powder solid form, designated Polymer 1. Amount 74.4 g, yield 93%.
- Polymers 2 to 11 and Reference Polymers 1 to 4 were synthesized by the same procedure as Synthesis Example 2-1 except that the type and proportion of monomers were changed. The structure of these polymers is identified below. Fractions of units incorporated are expressed in molar ratio.
- Resist compositions R-1 to R-11 and Comparative Resist compositions R-12 to R-15 in solution form were prepared by dissolving a polymer (Polymers 1 to 11 or Reference Polymers 1 to 4) as base resin, acid generator, basic compound, and water-repellent polymer in a solvent in accordance with the formulation of Table 1 and filtering through a Teflon® filter with a pore size of 0.2 ⁇ m.
- the solvent contained 0.01 wt % of surfactant KH-20 (Asahi Glass Co., Ltd.).
- the photoacid generator (PAG-1, PAG-2), quencher (Base-1), solvent, and water-repellent polymer (SF-1) used herein are identified below.
- a spin-on carbon film ODL-50 (Shin-Etsu Chemical Co., Ltd.) having a carbon content of 80 wt % was deposited to a thickness of 200 nm and a silicon-containing spin-on hard mask SHB-A940 having a silicon content of 43 wt % was deposited thereon to a thickness of 35 nm.
- the resist composition (R-1 to R-15) shown in Table 1 was spin coated, then baked on a hot plate at 100° C. for 60 seconds to form a resist film of 100 nm thick.
- first exposure was performed through a 6% halftone phase shift mask bearing a X-direction line pattern with a pitch of 80 nm and a line width of 40 nm (on-wafer size).
- Second exposure was then performed through a 6% halftone phase shift mask bearing a Y-direction line pattern with a pitch of 80 nm and a line width of 40 nm (on-wafer size).
- the wafer was baked (PEB) at the temperature shown in Table 2 for 60 seconds and developed.
- butyl acetate was injected from a development nozzle while the wafer was spun at 30 rpm for 3 seconds, which was followed by stationary puddle development for 27 seconds.
- the wafer was rinsed with 4-methyl-2-pentanol, spin dried, and baked at 100° C. for 20 seconds to evaporate off the rinse liquid.
- a spin-on carbon film ODL-50 (Shin-Etsu Chemical Co., Ltd.) having a carbon content of 80 wt % was deposited to a thickness of 200 nm and a silicon-containing spin-on hard mask SHB-A940 having a silicon content of 43 wt % was deposited thereon to a thickness of 35 nm.
- the resist composition (R-1 to R-15) shown in Table 1 was spin coated, then baked on a hot plate at 100° C. for 60 seconds to form a resist film of 100 nm thick.
- NSR-610C Nikon Corp., NA 1.30, ⁇ 0.98/0.78, 4/5 annular illumination
- Mask A is a 6% halftone phase shift mask bearing a line pattern with a pitch of 100 nm and a line width of 50 nm (on-wafer size).
- the wafer was baked (PEB) at the temperature shown in Table 3 for 60 seconds and developed. Specifically, butyl acetate was injected from a development nozzle while the wafer was spun at 30 rpm for 3 seconds, which was followed by stationary puddle development for 27 seconds. The wafer was rinsed with 4-methyl-2-pentanol, spin dried, and baked at 100° C. for 20 seconds to evaporate off the rinse liquid.
- Mask B is a 6% halftone phase shift mask bearing a line pattern with a pitch of 200 nm and a line width of 45 nm (on-wafer size).
- the wafer was baked (PEB) at the temperature shown in Table 3 for 60 seconds and developed. Specifically, butyl acetate was injected from a development nozzle while the wafer was spun at 30 rpm for 3 seconds, which was followed by stationary puddle development for 27 seconds. The wafer was rinsed with 4-methyl-2-pentanol, spin dried, and baked at 100° C. for 20 seconds to evaporate off the rinse liquid.
- trench pattern an isolated space pattern with a space width of 35 nm and a pitch of 200 nm.
- the optimum dose (Eop, mJ/cm 2 ) which provided an L/S pattern with a space width of 50 nm and a pitch of 100 nm on exposure through Mask A was determined.
- the results are shown in Table 3. A smaller value indicates higher sensitivity.
- EL (%) (
- LWR Line Width Roughness
- MEEF Mask Error Enhancement Factor
- the exposure dose and DOF which ensured to form a trench pattern with a space width of 35 nm on exposure through Mask B were defined as the optimum exposure dose and the optimum DOF, respectively.
- the depth ( ⁇ m) over which focus was changed that could form a resist pattern with a space width of 35 nm ⁇ 10% was determined and reported as DOF.
- the results are shown in Table 3. A larger value indicates a smaller change of pattern size with a change of DOF and hence, better DOF margin.
- the resist compositions within the scope of the invention form negative patterns via organic solvent development with the advantages of hole size uniformity, improved exposure latitude, LWR and MEEF of L/S patterns, and improved DOF margin of trench patterns.
- the compositions are advantageously applicable to the organic solvent development process.
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Abstract
Description
- Patent Document 1: JP-A 2008-281974
- Patent Document 2: JP-A 2008-281975
- Patent Document 3: JP 4554665
- Patent Document 4: JP 4590431
- Patent Document 5: JP-A 2008-309879
- Non-Patent Document 1: Proc. SPIE Vol. 5377, p. 255 (2004)
- Non-Patent Document 2: IEEE IEDM Tech. Digest 61 (1996)
- Non-Patent Document 3: Proc. SPIE Vol. 7274, p. 72740N (2009)
Herein R1 is hydrogen, methyl or trifluoromethyl, R2 and R3 are each independently a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms, R2 and R3 may bond together to form a ring with the carbon atom to which they are attached, R4 to R9 are each independently hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms, R4 and R8 may bond together to form a 5 or 6-membered ring with the carbon atoms to which they are attached, R10 is a straight, branched or cyclic monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms, A1 is a straight, branched or cyclic divalent hydrocarbon group of 1 to 10 carbon atoms, k1 is 0 or 1, and n1A is an integer of 0 to 2.
Herein R1 is hydrogen, methyl or trifluoromethyl, R10 is a straight, branched or cyclic monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms, R11 is hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms, Z1 forms a C5-C15 alicyclic group with the carbon atom to which it is attached, and A2 is methylene or ethylene.
Herein R1 is as defined above, XA is an acid labile group, XB and XC are each independently a single bond or a straight or branched, divalent hydrocarbon group of 1 to 4 carbon atoms, XD is a straight, branched or cyclic, di- to pentavalent aliphatic hydrocarbon group of 1 to 16 carbon atoms in which a constituent —CH2— may be substituted by —O— or —C(═O)—, XE is an acid labile group, YA is a substituent group of lactone, sultone or carbonate structure, ZA is hydrogen, a fluoroalkyl group of 1 to 15 carbon atoms or a fluoroalcohol-containing group of 1 to 15 carbon atoms, k1A is an integer of 1 to 3, and k1B is an integer of 1 to 4.
Herein R20, R24, and R28 each are hydrogen or methyl; R21 is a single bond, phenylene, —O—R33—, or —C(═O)—Y—R33—, wherein Y is oxygen or NH and R33 is a straight, branched or cyclic C1-C6 alkylene or alkenylene group or phenylene group, which may contain a carbonyl (—CO—), ester (—COO—), ether (—O—), or hydroxyl moiety; R22, R23, R25, R26, R27, R29, R30, and R31 are each independently a straight, branched or cyclic C1-C12 alkyl group which may contain a carbonyl, ester or ether moiety, a C6-C12 aryl group, a C7-C20 aralkyl group, or a thiophenyl group; Z0 is a single bond, methylene, ethylene, phenylene, fluorinated phenylene, —O—R32—, or —C(═O)—Z1—R32—, wherein Z1 is oxygen or NH, and R32 is a straight, branched or cyclic C1-C6 alkylene or alkenylene group or phenylene group, which may contain a carbonyl, ester, ether or hydroxyl moiety; and M− is a non-nucleophilic counter ion.
Herein R1 is hydrogen, methyl or trifluoromethyl. R2 and R3 are each independently a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. R2 and R3 may bond together to form a ring with the carbon atom to which they are attached. R4 to R9 are each independently hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. R4 and R8 may bond together to form a 5 or 6-membered ring with the carbon atoms to which they are attached. R10 is a straight, branched or cyclic monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms. A1 is a straight, branched or cyclic divalent hydrocarbon group of 1 to 10 carbon atoms, k1 is 0 or 1, and n1A is an integer of 0 to 2.
Herein R1 is hydrogen, methyl or trifluoromethyl. R10 is a straight, branched or cyclic, monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms. R11 is hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. Z1 forms a C5-C15 alicyclic group with the carbon atom to which it is attached. A2 is methylene or ethylene.
Herein R1 to R10, A1, N1A, and k1 are as defined above. R12 is a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. X1 is a halogen atom, hydroxyl group or —OR13 wherein R13 is methyl, ethyl or a group of the following formula (14).
X2 is a halogen atom, hydroxyl group or —OR14 wherein R14 is methyl, ethyl or a group of the following formula (15).
When an acid chloride such as carboxylic acid chloride is used as the esterifying agent (11), the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding diol compound (10), acid chloride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating. When a carboxylic anhydride is used as the esterifying agent (11), the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding diol compound (10), carboxylic anhydride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating.
When an acid chloride, typically carboxylic acid chloride such as methacrylic acid chloride is used as the esterifying agent (13), the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding hydroxy-ester compound (12), acid chloride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating. When a carboxylic anhydride such as methacrylic anhydride is used as the esterifying agent (13), the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding hydroxy-ester compound (12), carboxylic anhydride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating. When a carboxylic acid of formula (13) wherein X2 is hydroxy is used as the esterifying agent (13), the reaction may be conducted by heating hydroxy-ester compound (12) and carboxylic acid such as methacrylic acid in a solvent (e.g., toluene or hexane) in the presence of an acid catalyst while water formed during reaction may be removed out of the system if desired. Suitable acid catalysts used herein include mineral acids such as hydrochloric acid, sulfuric acid, nitric acid and perchloric acid and organic acids such as p-toluenesulfonic acid and benzenesulfonic acid. When an acid anhydride, typically methacrylic acid anhydride is used as the esterifying agent (13), the reaction may be conducted in a solventless system or in a solvent (e.g., methylene chloride, acetonitrile, toluene or hexane) by adding hydroxy-ester compound (12), acid anhydride, and a base (e.g., triethylamine, pyridine or 4-dimethylaminopyridine) in sequence or at the same time, and optional cooling or heating.
Herein R1 is hydrogen, methyl or trifluoromethyl. R2 and R3 are each independently a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. R2 and R3 may bond together to form a ring with the carbon atom to which they are attached. R4 to R9 are each independently hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. R4 and R8 may bond together to form a 5 or 6-membered ring with the carbon atoms to which they are attached. R10 is a straight, branched or cyclic monovalent hydrocarbon or fluorinated hydrocarbon group of 1 to 15 carbon atoms. R11 is hydrogen or a straight, branched or cyclic monovalent hydrocarbon group of 1 to 10 carbon atoms. Z1 forms a C5-C15 alicyclic group with the carbon atom to which it is attached. A1 is a straight, branched or cyclic divalent hydrocarbon group of 1 to 10 carbon atoms. A2 is methylene or ethylene, k1 is 0 or 1, and n1A is an integer of 0 to 2.
Herein R1 to R5 and R8 to R10 are as defined above, R3ba and R3bb each are hydrogen or a monovalent hydrocarbon group.
Herein R1 is as defined above. XA is an acid labile group. XB and XC are each independently a single bond or a straight or branched, divalent hydrocarbon group of 1 to 4 carbon atoms. XD is a straight, branched or cyclic, di- to pentavalent aliphatic hydrocarbon group of 1 to 16 carbon atoms in which a constituent —CH2— may be substituted by —O— or —C(═O)—. XE is an acid labile group. YA is a substituent group of lactone, sultone or carbonate structure. ZA is hydrogen, a fluoroalkyl group of 1 to 15 carbon atoms or a fluoroalcohol-containing group of 1 to 15 carbon atoms, k1A is an integer of 1 to 3, and k1B is an integer of 1 to 4.
Herein RL01 and RL02 are each independently hydrogen or a straight, branched or cyclic alkyl group of 1 to 18 carbon atoms, preferably 1 to 10 carbon atoms. RL03 is a monovalent hydrocarbon group of 1 to 18 carbon atoms, preferably 1 to 10 carbon atoms, which may contain a heteroatom such as oxygen, examples of which include straight, branched or cyclic alkyl groups, substituted forms of such alkyl groups in which some hydrogen atoms are replaced by hydroxyl, alkoxy, oxo, amino, alkylamino or the like, and similar groups which are separated by ether oxygen. RL04 is a tertiary alkyl group of 4 to 20 carbon atoms, preferably 4 to 15 carbon atoms, a trialkylsilyl group in which each alkyl moiety has 1 to 6 carbon atoms, an oxoalkyl group of 4 to 20 carbon atoms, or a group of formula (L1). RL05 is an optionally substituted, straight, branched or cyclic C1-C10 alkyl group or an optionally substituted C6-C20 aryl group. RL06 is an optionally substituted, straight, branched or cyclic C1-C10 alkyl group or an optionally substituted C6-C20 aryl group. RL07 to RL16 independently represent hydrogen or optionally substituted monovalent hydrocarbon groups of 1 to 15 carbon atoms. Letter y is an integer of 0 to 6, m is equal to 0 or 1, n is equal to 0, 1, 2 or 3, and 2 m+n is equal to 2 or 3.
Herein R20, R24 and R28 each are hydrogen or methyl. R21 is a single bond, phenylene, —O—R33—, or —C(═O)—Y—R33— wherein Y is oxygen or NH and R33 is a straight, branched or cyclic C1-C6 alkylene or alkenylene group or phenylene group, which may contain a carbonyl (—CO—), ester (—COO—), ether (—O—) or hydroxyl moiety. R22, R23, R25, R26, R27, R29, R30, and R31 are each independently a straight, branched or cyclic C1-C12 alkyl group which may contain a carbonyl, ester or ether moiety, or a C6-C12 aryl group, C7-C20 aralkyl group, or thiophenyl group. Z0 is a single bond, methylene, ethylene, phenylene, fluorinated phenylene, —O—R32—, or —C(═O)—Z1—R32— wherein Z1 is oxygen or NH and R32 is a straight, branched or cyclic C1-C6 alkylene or alkenylene group or phenylene group, which may contain a carbonyl, ester, ether or hydroxyl moiety. M− is a non-nucleophilic counter ion.
- PAG-1: triphenylsulfonium 2-(adamantane-1-carbonyloxy)-1,1,3,3,3-pentafluoropropanesulfonate
- PAG-2: 4-tert-butylphenyldiphenylsulfonium 2-(adamantane-1-carbonyloxy)-1,1,3,3,3-pentafluoropropanesulfonate
- Base-1: 2-morpholinoethyl octadecanoate
- PGMEA: 1-methyl-2-methoxyethyl acetate
- CyH: cyclohexanone
- Water-repellent polymer SF-1:
TABLE 1 | ||||||||
Water- | ||||||||
repellent | ||||||||
Resin | PAG | Quencher | polymer | Solvent 1 | Solvent 2 | |||
Resist | (pbw) | (pbw) | (pbw) | (pbw) | (pbw) | (pbw) | ||
Example | 1-1 | R-1 | Polymer 1 | PAG-1 | Base-1 | SF-1 | PGMEA | CyH |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
1-2 | R-2 | Polymer 2 | PAG-2 | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
1-3 | R-3 | Polymer 3 | PAG-1 | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
1-4 | R-4 | Polymer 4 | PAG-1 | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
1-5 | R-5 | Polymer 5 | PAG-1 | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
1-6 | R-6 | Polymer 6 | PAG-2 | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
1-7 | R-7 | Polymer 7 | PAG-1 | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
1-8 | R-8 | Polymer 8 | PAG-1 | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
1-9 | R-9 | Polymer 9 | — | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (1.5) | (6.0) | (2,000) | (500) | ||||
1-10 | R-10 | Polymer 10 | PAG-1 | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
1-11 | R-11 | Polymer 11 | PAG-1 | Base-1 | SF-1 | PGMEA | CyH | |
(100) | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
Comparative | 1-1 | R-12 | Reference | PAG-1 | Base-1 | SF-1 | PGMEA | CyH |
Example | Polymer 1 | (12.5) | (1.5) | (6.0) | (2,000) | (500) | ||
(100) | ||||||||
1-2 | R-13 | Reference | PAG-2 | Base-1 | SF-1 | PGMEA | CyH | |
Polymer 2 | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
(100) | ||||||||
1-3 | R-14 | Reference | PAG-1 | Base-1 | SF-1 | PGMEA | CyH | |
Polymer 3 | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
(100) | ||||||||
1-4 | R-15 | Reference | PAG-1 | Base-1 | SF-1 | PGMEA | CyH | |
Polymer 4 | (12.5) | (1.5) | (6.0) | (2,000) | (500) | |||
(100) | ||||||||
TABLE 2 | |||||
PEB | Dose | Hole size variation | |||
temperature | (mJ/ | 3σ | |||
Resist | (° C.) | cm2) | (nm) | ||
Example | 2-1 | R-1 | 90 | 37 | 1.5 |
2-2 | R-2 | 85 | 35 | 1.4 | |
2-3 | R-3 | 90 | 36 | 1.6 | |
2-4 | R-4 | 85 | 38 | 1.4 | |
2-5 | R-5 | 90 | 37 | 1.3 | |
2-6 | R-6 | 85 | 35 | 1.5 | |
2-7 | R-7 | 90 | 37 | 1.4 | |
2-8 | R-8 | 90 | 37 | 1.6 | |
2-9 | R-9 | 90 | 36 | 1.5 | |
2-10 | R-10 | 90 | 37 | 1.6 | |
2-11 | R-11 | 90 | 38 | 1.6 | |
Comparative | 2-1 | R-12 | 90 | 37 | 3.7 |
Example | 2-2 | R-13 | 85 | 35 | 3.8 |
2-3 | R-14 | 100 | 44 | 3.9 | |
2-4 | R-15 | 95 | 40 | 3.7 | |
EL(%)=(|E1−E2|/Eop)×100
wherein E1 is an exposure dose which provides an L/S pattern with a space width of 45 nm and a pitch of 100 nm, E2 is an exposure dose which provides an L/S pattern with a space width of 55 nm and a pitch of 100 nm, and Eop is the optimum exposure dose which provides an L/S pattern with a space width of 50 nm and a pitch of 100 nm. The results are shown in Table 3.
Evaluation of Line Width Roughness (LWR)
MEEF=(pattern space width)/(mask line width)−b
wherein b is a constant. The results are shown in Table 3. A value closer to unity (1) indicates better performance.
Evaluation of Depth-of-Focus (DOF) Margin
TABLE 3 | ||||||||
PEB | ||||||||
temper- | Eop | |||||||
Re- | ature | (mJ/ | EL | LWR | DOF | |||
sist | (° C.) | cm2) | (%) | (nm) | MEEF | (μm) | ||
Example | 3-1 | R-1 | 90 | 25 | 18 | 3.4 | 2.1 | 0.18 |
3-2 | R-2 | 85 | 28 | 15 | 3.1 | 1.9 | 0.15 | |
3-3 | R-3 | 90 | 26 | 17 | 3.2 | 2.0 | 0.14 | |
3-4 | R-4 | 85 | 28 | 16 | 3.3 | 1.9 | 0.15 | |
3-5 | R-5 | 90 | 25 | 15 | 3.3 | 2.1 | 0.16 | |
3-6 | R-6 | 85 | 27 | 18 | 3.2 | 2.2 | 0.17 | |
3-7 | R-7 | 90 | 25 | 17 | 3.1 | 2.3 | 0.16 | |
3-8 | R-8 | 90 | 26 | 16 | 3.4 | 2.2 | 0.15 | |
3-9 | R-9 | 90 | 25 | 16 | 3.3 | 2.0 | 0.14 | |
3-10 | R-10 | 90 | 25 | 18 | 3.2 | 2.1 | 0.17 | |
3-11 | R-11 | 90 | 25 | 17 | 3.3 | 2.3 | 0.16 | |
Compar- | 3-1 | R-12 | 90 | 40 | 11 | 7.2 | 4.2 | 0.05 |
ative | 3-2 | R-13 | 85 | 28 | 12 | 6.8 | 4.4 | 0.07 |
Example | 3-3 | R-14 | 100 | 33 | 10 | 7.3 | 4.4 | 0.06 |
3-4 | R-15 | 95 | 28 | 10 | 6.9 | 4.5 | 0.05 | |
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